czlonkowski n8n-mcp up to 2.51.2 Request Parameter insertion of sensitive information into sent data

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability classified as problematic was found in czlonkowski n8n-mcp up to 2.51.2. Affected is an unknown function of the component Request Parameter Handler. Executing a manipulation can lead to insertion of sensitive information into sent data. The identification of this vulnerability is CVE-2026-45582. The attack may be launched remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability was found in czlonkowski n8n-mcp up to 2.51.2. It has been declared as problematic. This vulnerability affects an unknown function of the component Request Parameter Handler. The manipulation with an unknown input leads to a insertion of sensitive information into sent data vulnerability. The CWE definition for the vulnerability is CWE-201. The code transmits data to another actor, but a portion of the data includes sensitive information that should not be accessible to that actor. As an impact it is known to affect confidentiality. CVE summarizes:

n8n-MCP is an MCP server that provides AI assistants access to n8n node documentation, properties, and operations. Prior to 2.51.3, the workflow telemetry sanitizer could retain partial fragments of URL-shaped node parameters before sending workflow data to the project's anonymous telemetry backend. Values placed in HTTP-Request-style node parameters — such as customer or tenant identifiers, short secrets embedded in query strings, and signed request parameters — could therefore appear in stored telemetry, contrary to the collection boundary documented in PRIVACY.md. This vulnerability is fixed in 2.51.3.

The advisory is available at github.com. This vulnerability was named CVE-2026-45582 since 05/12/2026. The exploitation appears to be easy. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1592 by the MITRE ATT&CK project.

Upgrading to version 2.51.3 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 6cf6fef653fcd6d598f2f356aac4754931c7329f is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub_M): 🔒

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Insertion of sensitive information into sent data
CWE: CWE-201 / CWE-200 / CWE-284
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: n8n-mcp 2.51.3
Patch: 6cf6fef653fcd6d598f2f356aac4754931c7329f

Timelineinfo

05/12/2026 CVE reserved
05/29/2026 +17 days Advisory disclosed
05/29/2026 +0 days VulDB entry created
05/29/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: GHSA-f3rg-xqjj-cj9w
Status: Confirmed

CVE: CVE-2026-45582 (🔒)
GCVE (CVE): GCVE-0-2026-45582
GCVE (VulDB): GCVE-100-367234

Entryinfo

Created: 05/29/2026 17:21
Changes: 05/29/2026 17:21 (69)
Complete: 🔍
Cache ID: 216::103

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